Questions Comprendre
5. Comment appelle-t-on la plus petite particule d'eau ?
6. Cite les propriétés des molécules dans le modèle proposé.
7. Les molécules d'eau sont-elles différentes selon l'état physique de l'eau ?
8. Quelle est la différence entre un corps pur et un mélange à l'échelle moléculaire ?
Raisonner
9. Les molécules d'eau sont-elles visibles à l'oeil nu ? Justifie ta réponse.
atière.
Conclure
10. Comment modélise-t-on la matière ? Quelle est l'utilité d'un modèle ?
Chapitre 2. Décrire la constitution de la matière
31

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Under what conditions will a gas be most likely to exhibit the ideal gas properties predicted by the ideal gas law? 1)high pressures and high temperature, because particles are forced closer together with higher kinetic energy, so intermolecular forces of attraction are weaker 2)high pressure and low temperature, because particles are forced closer together and moving slower, so the volume of the particles is less significant 3) low pressure and high temperature, because particles are spread farther apart and moving faster, so the intermolecular forces of attraction are weaker 4)low pressure and low temperature, because particles are spread farther apart with lower kinetic energy, so the volume of the particles is less significant

When a wire with a current is placed in a magnetic field, electrical energy is transformed into mechanical energy select the best answer from the choices provided t f